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Distance-based threshold catchment areas (75th, 80th, 90th percentiles corresponding to the respective distances ≤7 miles, ≤8 miles, and ≤12 miles) for a federally qualified health center with locations shown in A) and B) serving New Castle County, Delaware, USA. Gradient represents a choropleth depiction of the density of patients for a given ZIP code (lighter shades of gray=low, darker shades of gray=high).
